Study On The Effect Of Electron-metal-support Interactions In Noble Metal-based Catalysts On The Catalytic Performances

Supported precious metal catalysts are generally composed of precious metal nanoparticles and metal oxidation carriers,which have strong catalytic performance and can be widely used in energy and chemical engineering,metal catalysis,environmental engineering and other fields.In this type of catalyst,the electron-metal-support interaction（EMSI）can affect the catalytic activity of the catalyst and change the catalytic performance of the catalyst,so the exploration of its mechanism and mode of action is particularly important.The specific work of this paper is as follows:The first part is to synthesize Co₃O₄ NW by urea precipitation method,use sodium borohydride surface treatment to produce oxygen vacancies,and use oxygen vacancies to anchor gold to prepare gold-based catalysts.For vanillin transfer hydrogenation reaction,it can finally achieve>99%conversion and>99%selectivity under the conditions of 240℃,3 h,40 mg.The influence of the solvent on the reaction is discussed.The active hydrogen comes from the H of the hydroxyl group in the alcohol and the H of the C attached to it.The hydrogen donating capacity:secondary carbon>primary carbon,providing experience for the choice of solvent for the transfer hydrogenation reaction.In the second part,a similar method was used to synthesize platinum and palladium-based catalysts,and the electron-metal-support interaction between the metal and the support was studied.The use of oxygen vacancies to anchor the gold will cause electron transfer between the gold and the carrier.The electrons are transferred from the carrier to the gold.With the transfer of electrons,the adsorption of the reactant functional groups by the catalyst is reversed,which changes the activity of the catalyst.It shows that there is an electron-metal-carrier interaction between the precious metal and the carrier,which affects the electronic state of the catalyst and improves the catalytic activity of the catalyst.Finally,the reaction processes of isopropanol dehydrogenation and vanillin hydrogenation are discussed,and the influence of temperature on the reaction selectivity is explained,which provides a basis for further research on the reaction.The study of electron-metal-support interaction also helps to open up the idea of catalyst design and provide new ideas for the preparation of high-efficiency catalysts.